scholarly journals Visualizing heavy fermions emerging in a quantum critical Kondo lattice

Nature ◽  
2012 ◽  
Vol 486 (7402) ◽  
pp. 201-206 ◽  
Author(s):  
Pegor Aynajian ◽  
Eduardo H. da Silva Neto ◽  
András Gyenis ◽  
Ryan E. Baumbach ◽  
J. D. Thompson ◽  
...  
Keyword(s):  
Heavy Fermions ◽  
Kondo Lattice ◽  
Quantum Critical

scholarly journals Zooming in on heavy fermions in Kondo lattice models

2021 ◽  
Vol 104 (15) ◽  
Author(s):  
Bimla Danu ◽  
Zihong Liu ◽  
Fakher F. Assaad ◽  
Marcin Raczkowski
Keyword(s):  
Heavy Fermions ◽  
Lattice Models ◽  
Kondo Lattice

Drastic change of the electronic states at the quantum critical point in heavy fermions

2007 ◽  
Vol 310 (2) ◽  
pp. 541-547 ◽  
Author(s):  
R. Settai ◽  
H. Shishido ◽  
T. Kubo ◽  
S. Araki ◽  
T.C. Kobayashi ◽  
...  
Keyword(s):  
Critical Point ◽  
Heavy Fermions ◽  
Quantum Critical Point ◽  
Electronic States ◽  
Drastic Change ◽  
Quantum Critical

scholarly journals Quantum critical scaling and fluctuations in Kondo lattice materials

2017 ◽  
Vol 114 (24) ◽  
pp. 6250-6255 ◽  
Author(s):  
Yi-feng Yang ◽  
David Pines ◽  
Gilbert Lonzarich
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Kondo Lattice ◽  
Critical Scaling ◽  
Critical Fluctuations ◽  
Lattice Materials ◽  
Heavy Electron ◽  
Logarithmic Scaling ◽  
Quantum Critical ◽  
Quantum Critical Scaling

We propose a phenomenological framework for three classes of Kondo lattice materials that incorporates the interplay between the fluctuations associated with the antiferromagnetic quantum critical point and those produced by the hybridization quantum critical point that marks the end of local moment behavior. We show that these fluctuations give rise to two distinct regions of quantum critical scaling: Hybridization fluctuations are responsible for the logarithmic scaling in the density of states of the heavy electron Kondo liquid that emerges below the coherence temperature T∗, whereas the unconventional power law scaling in the resistivity that emerges at lower temperatures below TQC may reflect the combined effects of hybridization and antiferromagnetic quantum critical fluctuations. Our framework is supported by experimental measurements on CeCoIn5, CeRhIn5, and other heavy electron materials.

scholarly journals Role of disorder on the quantum critical point of a model for heavy fermions

2001 ◽  
Vol 64 (14) ◽  
Author(s):  
T. G. Rappoport ◽  
A. Saguia ◽  
B. Boechat ◽  
M. A. Continentino
Keyword(s):  
Critical Point ◽  
Heavy Fermions ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2−δAs2

2015 ◽  
Vol 112 (44) ◽  
pp. 13520-13524 ◽  
Author(s):  
Yongkang Luo ◽  
F. Ronning ◽  
N. Wakeham ◽  
Xin Lu ◽  
Tuson Park ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Carrier Density ◽  
Quantum Critical Point ◽  
Quantum Criticality ◽  
Kondo Lattice ◽  
Antiferromagnetic Order ◽  
Zero Temperature ◽  
Electrical Transport Properties ◽  
Continuous Transition ◽  
Quantum Critical

The easily tuned balance among competing interactions in Kondo-lattice metals allows access to a zero-temperature, continuous transition between magnetically ordered and disordered phases, a quantum-critical point (QCP). Indeed, these highly correlated electron materials are prototypes for discovering and exploring quantum-critical states. Theoretical models proposed to account for the strange thermodynamic and electrical transport properties that emerge around the QCP of a Kondo lattice assume the presence of an indefinitely large number of itinerant charge carriers. Here, we report a systematic transport and thermodynamic investigation of the Kondo-lattice system CeNi2−δAs2 (δ ≈ 0.28) as its antiferromagnetic order is tuned by pressure and magnetic field to zero-temperature boundaries. These experiments show that the very small but finite carrier density of ∼0.032 e−/formular unit in CeNi2−δAs2 leads to unexpected transport signatures of quantum criticality and the delayed development of a fully coherent Kondo-lattice state with decreasing temperature. The small carrier density and associated semimetallicity of this Kondo-lattice material favor an unconventional, local-moment type of quantum criticality and raises the specter of the Nozières exhaustion idea that an insufficient number of conduction-electron spins to separately screen local moments requires collective Kondo screening.

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